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#
# Copyright (c) 2024 Analog Devices Inc.
#
# This file is part of libm2k
# (see http://www.github.com/analogdevicesinc/libm2k).
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 2.1 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import libm2k
'''
This example uses EVAL-ADT7420-PMDZ as a slave
Hardware configuration:
(ADALM2000) DIO_0 <---> Pin 1 (ADT7420) <---> 10 kilohms resistor <--- V+ (ADALM2000)
(ADALM2000) DIO_1 <---> Pin 3 (ADT7420) <---> 10 kilohms resistor <--- V+ (ADALM2000)
(ADALM2000) GND <---> Pin 5 (ADT7420)
(ADALM2000) V+ ---> Pin 7 (ADT7420)
'''
def convert_temperature(data):
msb_temp = data[0]
lsb_temp = data[1]
temperature = (msb_temp << 8) + lsb_temp
if temperature & 0x8000:
temperature = (temperature - 65536) / 128
else:
temperature = temperature / 128
return temperature
def main():
context = libm2k.m2kOpen("ip:192.168.2.1")
if context is None:
print('Connection Error: No ADALM2000 device available/connected to your PC.')
exit(1)
print('Calibrating ADC . . .')
context.calibrateADC()
power_supply = context.getPowerSupply()
power_supply.enableChannel(0, True)
power_supply.pushChannel(0, 3.3)
m2k_i2c_init = libm2k.m2k_i2c_init()
m2k_i2c_init.scl = 0
m2k_i2c_init.sda = 1
m2k_i2c_init.context = context
i2c_init_param = libm2k.i2c_init_param()
i2c_init_param.max_speed_hz = 100000
i2c_init_param.slave_address = 0x48
i2c_init_param.extra = m2k_i2c_init
i2c_desc = libm2k.i2c_init(i2c_init_param)
if i2c_desc is None:
print('I2C Error: Could not configure I2C')
exit(1)
print('Initiating I2C transfer . . .')
if libm2k.i2c_write(i2c_desc, bytearray([0x0B]), libm2k.i2c_general_call | libm2k.i2c_repeated_start) == -1:
exit(1)
data_read_config = bytearray(1)
libm2k.i2c_read(i2c_desc, data_read_config, libm2k.i2c_general_call)
if len(data_read_config) == 0:
exit(1)
print('Reading the temperature . . .')
if libm2k.i2c_write(i2c_desc, bytearray([0]), libm2k.i2c_general_call | libm2k.i2c_repeated_start) == -1:
exit(1)
data_read_temperature = bytearray(2)
libm2k.i2c_read(i2c_desc, data_read_temperature, libm2k.i2c_general_call)
if len(data_read_temperature) == 0:
exit(1)
temperature = convert_temperature(data_read_temperature)
print('Temperature: ' + str(temperature) + '\u2103')
libm2k.i2c_remove(i2c_desc)
libm2k.contextClose(context, True)
if __name__ == "__main__":
main()
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